撒谎只有零次和无数次的区别。

One lie makes many.

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比赛前他做了零次轻度的训练。

He had two light training sessions leading up to the game.

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同时本文还就如何获取零次情报做了具体阐述。

How to collect zero information is also discussed.

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操作符 *匹配之前的表达式零次或零次以上。

The * operator matches the previous expression 0 or more times.

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为什么？回想一下操作符 *可以匹配零次或多次。

Why? Recall that the operator * can match zero or more times.

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使用星号（*）表示要出现零次或一次以上（含一次）。

Use an asterisk (*) for zero or more times.

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号后面的正则表达式可以匹配这个正则表达式的零次或一次出现。

A regular expression followed by? Matches zero or one occurrence of the regular expression.

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号后面的正则表达式可以匹配这个正则表达式的零次或一次出现。

A regular expression followed by? Matches zero or one occurrence of the regular expression.

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